Malicious PDF — malware analysis report

Static analysis result for SHA-256 62c89fb6487e2f30…

MALICIOUS

PDF

107.2 KB Created: 2021-04-03 09:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1870cc074f4c054990f36bf06418ab60 SHA-1: 877a4901802bebd0ff161b5362fba699048b5250 SHA-256: 62c89fb6487e2f30b7f76e6429875f540d28cb254c59c7dfe497cc2aaaff35a0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://kuzutuzo.ru/award?keyword=analyse+physico+chimique+des+eaux+us%25C3%25A9es+pdf PDF link annotation
    • https://cdn.sqhk.co/wujakegu/egiqNlS/nifubugimijojuril.pdfIn PDF document text
    • https://cdn.sqhk.co/sanobude/eKYfNgg/chappal_chirugali_audio_songs_free.pdfIn PDF document text
    • https://cdn.sqhk.co/tovipovo/eD5RLkm/zusotoz.pdfIn PDF document text
    • https://cdn.sqhk.co/kuxixixixi/zhe2haC/anth_film_video.pdfIn PDF document text
    • https://cdn.sqhk.co/jebumujo/ahcokjj/85732335521.pdfIn PDF document text
    • http://iclod.tech/viwutogipiga3.pdfIn PDF document text
    • https://cdn.sqhk.co/bosesegivu/sgeO2fz/zidanalowagexirelaz.pdfIn PDF document text
    • http://cabinetsop.xyz/what_does_fight_for_your_honor_meanl4q2c.pdfIn PDF document text
    • https://cdn.sqhk.co/lisakopew/ibieibb/26956642434.pdfIn PDF document text
    • http://vilopeg.xyz/jump_on_it_my_pony_magic_mikey3529.pdfIn PDF document text
    • https://cdn.sqhk.co/sebixodof/2mqFobo/pocket_watches_for_mens_antique.pdfIn PDF document text
    • https://cdn.sqhk.co/nivunufozub/MrEighb/zupelijanuxedowinaxon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/kajatexa.pdfIn PDF document text
    • http://romigutik.epizy.com/73715552563.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/salokoruk.pdfIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/26841330638.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/90951522643.pdfIn PDF document text
    • http://pexabeni.rf.gd/are_old_car_seats_safe.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/48496198443.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/free_bootstrap_templates_for_cv.pdfIn PDF document text
    • http://magujale.rf.gd/yajur_veda_in_odia.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015f81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F81 5724 bytes
SHA-256: c8db7ec8cabd8d54adce99d0cf78c1ae5ffb6c8186c088414531e18a65edbc46
font_01_sfnt_off000172ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172AC 13516 bytes
SHA-256: aaae222fe88735be38fa715516959ae780fde564cf4620cfa2cdcc2e307356fe